Wordpress Issue

I recently integrated a WP blog into a static XHTML site. The site is nearing completion and I found an annoying issue in the comments section of the blog. If you select the "comments" link of any post the css seems to break. This can be seen in the bottom portion of the blog where the closing image of the "blog" div is pushed about 10px below the actual "blogPost" div. This doesn't occur on the index.php page itself. I am sort of new to integrating WP blogs into sites so any suggestions into fixing this would be greatly appreciated.